Need help to customize toPlainText() to include checkboxes

[maelchiotti]

Hi, for my note-taking app I need to display the beginning of a note as plain text in the notes list as a preview of the note's content.

I would like to include checkboxes, by replacing the with emojis (✅ and ⬜). I could later extend this to also supports lists for example, but I'll stick to checkboxes for now.

I have already written this code that parses the Operations, but it doesn't always work (especially when there are multiple lines with the same checkbox and no text and they get unified in the same Operation with multiple new lines). Before trying to improve it or extend it, I want to know if there is a better way?

  String get contentPreview {
  var content = '';

  // Here 'document' is a ParchmentDocument
  for (final child in document.root.children) {
    final operations = child.toDelta().toList();

    for (var i = 0; i < operations.length; i++) {
      final operation = operations[i];

      // Skip horizontal rules
      if (operation.data is Map &&
          (operation.data as Map).containsKey('_type') &&
          (operation.data as Map)['_type'] == 'hr') {
        continue;
      }

      final nextOperation = i == operations.length - 1 ? null : operations[i + 1];

      final checklist = nextOperation != null &&
          nextOperation.attributes != null &&
          nextOperation.attributes!.containsKey('block') &&
          nextOperation.attributes!['block'] == 'cl';

      if (checklist) {
        final checked = nextOperation.attributes!.containsKey('checked');
        content += '${checked ? '✅' : '⬜'} ${operation.value}';
      } else {
        content += operation.value.toString();
      }
    }
  }

  return content.trim();
}